Synchronous Operation; Figure 19.9 Example Of Scif Receive Operation (8-Bit Data, Parity, One Stop Bit); Figure 19.10 Example Of Operation Using Modem Control (Rts) - Renesas HD6417641 Hardware Manual

Start
1
bit
Serial
data
RDF
FER

Figure 19.9 Example of SCIF Receive Operation (8-Bit Data, Parity, One Stop Bit)

5. When modem control is enabled, the RTS signal is output depending on the empty status of
SCFRDR. When RTS is 0, reception is possible. When RTS is 1, this indicates that SCFRDR
exceeds the number set for the RTS output active trigger.
Figure 19.10 shows an example of the operation when modem control is used.
Start
bit
Serial data
0
RxD
RTS

Figure 19.10 Example of Operation Using Modem Control (RTS)

19.4.3

Synchronous Operation

In synchronous mode, the SCIF transmits and receives data in synchronization with clock pulses.
This mode is suitable for high-speed serial communication.
The SCIF transmitter and receiver are independent, so full-duplex communication is possible
while sharing the same clock. The transmitter and receiver are also 16-byte FIFO buffered, so
continuous transmitting or receiving is possible by reading or writing data while transmitting or
receiving is in progress.
Data Parity
bit
0 D0 D1 D7
RXI interrupt
request
One frame
Parity
bit
D0 D1 D2 D7 0/1
Section 19 Serial Communication Interface with FIFO (SCIF)
Stop Start
bit bit
0/1 1 0 D0 D1
Data read and RDF flag
read as 1 then cleared to
0 by RXI interrupt handler
Stop Start
bit bit
1
Rev. 4.00 Sep. 14, 2005 Page 733 of 982
Data Parity Stop
bit bit
D7 0/1 0
ERI interrupt request
generated by receive
error
0 D0 D1 D7 0/1
REJ09B0023-0400
0/1